Hybrid hydrogen production system capacity planning method and system considering overload operation and service life attenuation of electrolytic cell

Abstract

The invention discloses a hybrid hydrogen production system capacity planning method and system considering overload operation and service life attenuation of an electrolytic cell, and relates to the technical field of new energy hydrogen production. The method comprises the following steps: establishing a hydrogen production energy efficiency attenuation model and a service life attenuation model of an electrolytic cell, an operation model of the electrolytic cell, an operation model of an energy storage battery and an operation model of a hydrogen storage tank; establishing a hybrid hydrogen production system capacity planning mathematical model considering overload operation and service life attenuation of the electrolytic cell; and based on new energy historical output data, hydrogen load historical data and grid-connected power limit proportion historical data, solving the hybrid hydrogen production system capacity planning mathematical model by using a genetic algorithm, and determining an optimal capacity planning scheme of the hybrid hydrogen production system. Influences of overload operation and service life attenuation of the electrolytic cell are considered, so that the hybrid hydrogen production system can reliably and economically operate for a long time.

Description

Technical Field

[0001] The present application relates to the technical field of new energy hydrogen production, and in particular to a capacity planning method and system for a hybrid hydrogen production system taking into account overload operation and life attenuation of an electrolyzer. Background Art

[0002] At present, the penetration rate of new energy in some parts of China exceeds 80%, and local consumption is difficult to sustain. Hydrogen has the properties of clean, low-carbon, flexible and efficient energy. Using new energy to electrolyze water to produce hydrogen is considered to be a very promising new energy consumption method, which will play a major role in wind and solar consumption and flexible regulation of high-proportion new energy systems.

[0003] How to achieve the optimal economic capacity matching of the hydrogen production system is an important issue that needs to be urgently resolved in the field of capacity planning research on new energy hydrogen production systems. The output of new energy has the characteristics of strong fluctuations in a wide range, especially after the power grid has put forward the requirement of grid-connected power limit for new energy hydrogen production systems, the hydrogen production power will fluctuate frequently between 0 and 100% of the installed capacity of new energy. Reasonable use of the short-term overload operation characteristics of the electrolyzer can effectively reduce the capacity planning cost of the hydrogen production system. However, during the overload operation process, the electrolyzer will be in a high-temperature operation state, which can easily lead to reduced hydrogen production efficiency and service life attenuation. Therefore, how to carry out capacity planning of the hybrid hydrogen production system while taking into account the overload operation and life attenuation of the electrolyzer is an important issue that needs to be urgently resolved in the field of new energy hydrogen production system research. Summary of the invention

[0004] The purpose of this application is to provide a capacity planning method and system for a hybrid hydrogen production system that takes into account the overload operation and life decay of the electrolyzer, while taking into account the impact of the overload operation and life decay of the electrolyzer on the hybrid hydrogen production system, and meeting the long-term reliable operation requirements of the hybrid hydrogen production system.

[0005] To achieve the above objectives, this application provides the following solutions:

[0006] In a first aspect, the present application provides a capacity planning method for a hybrid hydrogen production system taking into account overload operation and life attenuation of an electrolyzer, the capacity planning method for a hybrid hydrogen production system taking into account overload operation and life attenuation of an electrolyzer comprises:

[0007] Constructing a hybrid hydrogen production system; the hybrid hydrogen production system includes a power grid, a new energy generator set, an electrolyzer, an energy storage battery and a hydrogen storage tank; the electrolyzer includes an ALK electrolyzer and a PEM electrolyzer;

[0008] Establish the hydrogen production efficiency attenuation model and the life attenuation model of the electrolyzer;

[0009] Establishing an operation model of an electrolyzer, an operation model of an energy storage battery, and an operation model of a hydrogen storage tank; the operation model of the electrolyzer is constructed based on a hydrogen production efficiency attenuation model of the electrolyzer;

[0010] Based on the life attenuation model of the electrolyzer, the operation model of the electrolyzer, the operation model of the energy storage battery and the operation model of the hydrogen storage tank, a capacity planning mathematical model of the hybrid hydrogen production system taking into account the overload operation and life attenuation of the electrolyzer is established;

[0011] Obtain the historical data of renewable energy output, hydrogen load and grid-connected power limit ratio of the hybrid hydrogen production system;

[0012] Based on the historical output data of new energy, the historical data of hydrogen load and the historical data of grid-connected power limit ratio, a genetic algorithm is used to solve the mathematical model of capacity planning of the hybrid hydrogen production system taking into account the overload operation and life attenuation of the electrolyzer, and determine the optimal capacity planning scheme of the hybrid hydrogen production system.

[0013] In a second aspect, the present application provides a capacity planning system for a hybrid hydrogen production system taking into account electrolyzer overload operation and life decay, the capacity planning system for a hybrid hydrogen production system taking into account electrolyzer overload operation and life decay is based on the capacity planning method for a hybrid hydrogen production system taking into account electrolyzer overload operation and life decay, the capacity planning system for a hybrid hydrogen production system taking into account electrolyzer overload operation and life decay comprises:

[0014] A hybrid hydrogen production system construction unit, used to construct a hybrid hydrogen production system; the hybrid hydrogen production system includes a power grid, a new energy generator set, an electrolyzer, an energy storage battery and a hydrogen storage tank; the electrolyzer includes an ALK electrolyzer and a PEM electrolyzer;

[0015] A hydrogen production energy efficiency attenuation model and a life attenuation model establishment unit, used to establish a hydrogen production energy efficiency attenuation model and a life attenuation model of an electrolyzer;

[0016] An operation model establishment unit, used to establish an operation model of the electrolyzer, an operation model of the energy storage battery and an operation model of the hydrogen storage tank; the operation model of the electrolyzer is constructed based on a hydrogen production energy efficiency attenuation model of the electrolyzer;

[0017] A hybrid hydrogen production system capacity planning mathematical model building unit is used to build a hybrid hydrogen production system capacity planning mathematical model taking into account electrolyzer overload operation and life attenuation based on the electrolyzer life attenuation model, electrolyzer operation model, energy storage battery operation model and hydrogen storage tank operation model;

[0018] A data acquisition unit, used to acquire the new energy historical output data, hydrogen load historical data and grid-connected power limit ratio historical data of the hybrid hydrogen production system;

[0019] The optimal capacity planning scheme determination unit is used to solve the capacity planning mathematical model of the hybrid hydrogen production system taking into account the overload operation and life attenuation of the electrolyzer based on the historical output data of new energy, the historical data of hydrogen load and the historical data of the grid-connected power limit ratio by using a genetic algorithm to determine the optimal capacity planning scheme of the hybrid hydrogen production system.

[0020] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0021] The present application discloses a capacity planning method and system for a hybrid hydrogen production system taking into account the overload operation and life decay of an electrolyzer. By constructing a hydrogen production energy efficiency decay model and a life decay model of an electrolyzer, the method fills the gap in the research field of the efficiency and life characteristic characterization of an electrolyzer when it is overloaded, and helps to guide the rational application of the overload operation characteristics of the hybrid hydrogen production system. The proposed capacity planning method for a hybrid hydrogen production system taking into account the overload operation and life decay of an electrolyzer enables the electrolyzer to give full play to its overload operation characteristics, thereby reducing the configuration capacity of the electrolyzer and reducing the planning cost of the hybrid hydrogen production system. At the same time, the influence of the overload operation and life decay of the electrolyzer is taken into account, so that the hybrid hydrogen production system can operate reliably and economically for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 An application environment diagram of a hybrid hydrogen production system capacity planning method taking into account electrolyzer overload operation and life attenuation provided in an embodiment of the present application;

[0024] Figure 2 A flow chart of a hybrid hydrogen production system capacity planning method taking into account electrolyzer overload operation and life attenuation provided in an embodiment of the present application;

[0025] Figure 3 A schematic diagram of the structure of a hybrid hydrogen production system provided in one embodiment of the present application;

[0026] Figure 4 A schematic diagram of functional modules of a capacity planning system for a hybrid hydrogen production system taking into account overload operation and life attenuation of an electrolyzer provided in one embodiment of the present application;

[0027] Reference numerals:

[0028] Terminal 102, server 104, hybrid hydrogen production system construction unit 1, hydrogen production energy efficiency attenuation model and life attenuation model establishment unit 2, operation model establishment unit 3, hybrid hydrogen production system capacity planning mathematical model establishment unit 4, data acquisition unit 5, optimal capacity planning scheme determination unit 6. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] Among the existing mainstream electrolysis technologies, alkaline (ALK) electrolyzers have low costs and a narrow power adjustment range, while proton exchange membrane (PEM) electrolyzers have high costs and strong adjustment flexibility. The organic combination of the two is an important way for new energy hydrogen production systems to balance economy and reliability.

[0031] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] In an exemplary embodiment, Figure 1 As shown, the capacity planning method of the hybrid hydrogen production system taking into account the overload operation and life attenuation of the electrolyzer provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown. Among them, the terminal 102 communicates with the server 104 through the network. The data storage system can store the data that the server 104 needs to process. The data storage system can be set up separately, or it can be integrated on the server 104, or it can be placed on the cloud or other servers. The terminal 102 can send the data to be processed to the server 104. After the server 104 receives the data to be processed, the server 104 performs capacity planning of the hybrid hydrogen production system for the data to be processed, and obtains the optimal capacity planning scheme of the hybrid hydrogen production system. The server 104 can feedback the obtained optimal capacity planning scheme to the terminal 102. In addition, in some embodiments, the capacity planning method of the hybrid hydrogen production system taking into account the overload operation and life decay of the electrolyzer can also be implemented separately by the server 104 or the terminal 102, such as the terminal 102 can directly target the data to be processed, or the server 104 can obtain the data to be processed from the data storage system, and perform capacity planning of the hybrid hydrogen production system taking into account the overload operation and life decay of the electrolyzer for the data to be processed.

[0033] The terminal 102 may be, but is not limited to, various desktop computers, laptop computers, smart phones, tablet computers, IoT devices, and portable wearable devices. The IoT devices may be smart speakers, smart TVs, smart air conditioners, smart vehicle-mounted devices, etc. The portable wearable devices may be smart watches, smart bracelets, head-mounted devices, etc. The server 104 may be implemented as an independent server or a server cluster consisting of multiple servers, or may be a cloud server.

[0034] In an exemplary embodiment, Figure 2 As shown, a capacity planning method for a hybrid hydrogen production system with overload operation and life attenuation of an electrolyzer is provided. The method is executed by a computer device, and can be executed by a computer device such as a terminal or a server alone, or by a terminal and a server together. In the embodiment of the present application, the method is applied to Figure 1 The server 104 in the example is used as an example to illustrate the method, which includes the following steps S1 to S6. Among them:

[0035] Step S1, constructing a hybrid hydrogen production system; Figure 3 As shown, the hybrid hydrogen production system includes a power grid, a new energy generator set, an electrolyzer, an energy storage battery and a hydrogen storage tank; the electrolyzer includes an ALK electrolyzer and a PEM electrolyzer.

[0036] Step S2, establishing a hydrogen production efficiency attenuation model of the electrolyzer and a life attenuation model of the electrolyzer.

[0037] As an optional implementation, in step S2, the hydrogen production energy efficiency attenuation model of the electrolyzer includes the hydrogen production energy efficiency attenuation model of the ALK electrolyzer and the hydrogen production energy efficiency attenuation model of the PEM electrolyzer; wherein the expression of the hydrogen production energy efficiency attenuation model of the ALK electrolyzer is:

[0038]

[0039] in, is the hydrogen production efficiency of the ALK electrolyzer at time period t; Rated hydrogen production efficiency for ALK electrolyzers; The rated hydrogen production efficiency degradation for ALK electrolyzers; is the energy efficiency attenuation of hydrogen production by the ALK electrolyzer during overload operation at time period t, It indicates the overload operation state of the ALK electrolyzer in the tth period; T indicates the upper limit of the time; Δt is the time interval.

[0040] In formula (1), the rated hydrogen production efficiency of ALK electrolyzer decays The expression is as follows:

[0041]

[0042] in, The extreme limiting hydrogen efficiency of the ALK electrolyzer before retirement, is the rated life of the ALK electrolyser.

[0043] The energy efficiency attenuation of hydrogen production caused by overload operation of the electrolyzer in the t period refers to the energy efficiency attenuation of hydrogen production caused by high temperature and other reasons when the electrolyzer is running under overload power. The energy efficiency attenuation of hydrogen production caused by overload operation of the ALK electrolyzer in the t period The expression is as follows:

[0044]

[0045] Among them, λ ALK is the hydrogen production efficiency attenuation coefficient of the ALK electrolyzer when operating under overload, is the rated power of the ALK electrolyzer.

[0046] The expression of the hydrogen production energy efficiency attenuation model of the PEM electrolyzer is:

[0047]

[0048] in, is the hydrogen production efficiency of the PEM electrolyzer at time period t; Rated hydrogen production efficiency for PEM electrolyzers; The rated hydrogen production efficiency decay for PEM electrolyzers; The energy efficiency attenuation of hydrogen production by the PEM electrolyzer during overload operation in period t; Indicates the overload operation state of the PEM electrolyzer in the tth period.

[0049] In formula (4), the rated hydrogen production efficiency of the PEM electrolyzer decays The expression is as follows:

[0050]

[0051] in, The extreme limiting hydrogen efficiency before the retirement of PEM electrolyzers, is the rated life of the PEM electrolyzer.

[0052] Energy efficiency decay of hydrogen production by PEM electrolyzer during overload operation at time t The expression is as follows:

[0053]

[0054] Among them, λ PEM is the hydrogen production efficiency attenuation coefficient of the PEM electrolyzer when operating under overload, is the rated power of the PEM electrolyzer.

[0055] As an optional implementation, in step S2, the life decay model of the electrolytic cell includes the life decay model of the ALK electrolytic cell and the life decay model of the PEM electrolytic cell; wherein the expression of the life decay model of the ALK electrolytic cell is:

[0056]

[0057] in, is the remaining life of the ALK electrolyzer in period t; is the rated life of the ALK electrolyzer; is the rated life decay of the ALK electrolyzer; is the overload operation life attenuation of the ALK electrolyzer in period t.

[0058] In formula (7), the expression of rated life attenuation of ALK electrolyzer is as follows:

[0059]

[0060] The expression of the overload life attenuation of the ALK electrolyzer in the tth period is as follows:

[0061]

[0062] The expression of the life attenuation model of the PEM electrolyzer is:

[0063]

[0064] in, is the remaining life of the PEM electrolyzer in the tth period; is the rated life of the PEM electrolyzer; is the rated life decay of the PEM electrolyzer; is the overload operation life decay of the PEM electrolyzer in period t.

[0065] In formula (10), the expression for the rated life attenuation of the PEM electrolyzer is:

[0066]

[0067] The expression of the overload life attenuation of the PEM electrolyzer in the tth period is:

[0068]

[0069] Step S3, establishing an operation model of the electrolyzer, an operation model of the energy storage battery and an operation model of the hydrogen storage tank. The operation model of the electrolyzer is constructed based on the hydrogen production efficiency attenuation model of the electrolyzer.

[0070] As an optional implementation, in step S3, the operation model of the electrolyzer includes the operation model of the ALK electrolyzer and the operation model of the PEM electrolyzer. The expression of the operation model of the ALK electrolyzer is:

[0071]

[0072] Among them, P t ALK is the power of the ALK electrolyzer in the tth period; P t re,ALK P is the power output from the new energy generator to the ALK electrolyzer in the t period; t grid+,ALK is the power output from the grid to the ALK electrolyzer in period t; P t ch,ALK is the power output from the energy storage battery to the ALK electrolyzer at time period t; is the hydrogen production efficiency of the ALK electrolyzer at time period t; is the mass of hydrogen produced by the ALK electrolyzer in time period t.

[0073] The expression of the operation model of the PEM electrolyzer is:

[0074] P t PEM =P t re,PEM +P t grid+,PEM +P t ch,PEM (15)

[0075] G t h,PEM =η t PEM P t PEM (16)

[0076] Among them, P t PEM is the power of the PEM electrolyzer in the tth period; P t re,PEM P is the power output from the new energy generator to the PEM electrolyzer at the t period; t grid+,PEM is the power output from the power grid to the PEM electrolyzer in period t; P t ch,PEM is the power output from the energy storage battery to the PEM electrolyzer at time period t; is the hydrogen production efficiency of the PEM electrolyzer at time period t; is the mass of hydrogen produced by the PEM electrolyzer in the tth period.

[0077] The expression of the operation model of the energy storage battery is:

[0078]

[0079] in, is the capacity of the energy storage battery at the tth period; is the capacity of the energy storage battery in the t-1 period; η bat,ch is the charging efficiency of the energy storage battery; η bat,dis is the discharge efficiency of the energy storage battery; P t ch is the charging power of the energy storage battery in the tth period; P t dis is the discharge power of the energy storage battery in the tth period; Δt is the time interval.

[0080] The expression of the operation model of the hydrogen storage tank is:

[0081]

[0082] in, is the capacity of the hydrogen storage tank at time period t; is the capacity of the hydrogen storage tank at the t-1 period; is the hydrogen filling mass of the hydrogen storage tank at the tth period; is the hydrogen discharge mass of the hydrogen storage tank in the tth period; η ht,ch is the hydrogen filling efficiency of the hydrogen storage tank; η ht,dis is the hydrogen release efficiency of the hydrogen storage tank.

[0083] Step S4, based on the life attenuation model of the electrolyzer, the operation model of the electrolyzer, the operation model of the energy storage battery and the operation model of the hydrogen storage tank, a capacity planning mathematical model of the hybrid hydrogen production system taking into account the overload operation and life attenuation of the electrolyzer is established.

[0084] As an optional implementation, in step S4, the mathematical model for capacity planning of the hybrid hydrogen production system taking into account overload operation and life attenuation of the electrolyzer includes an objective function and constraints; the objective function aims to minimize the annual total cost of the hybrid hydrogen production system, and the constraints include power balance constraints, hydrogen load constraints, grid-connected power constraints, maximum capacity constraints of the electrolyzer, start and stop time constraints of the electrolyzer, overload operation time constraints of the electrolyzer, upper and lower power constraints of the electrolyzer, climbing power constraints of the electrolyzer, maximum capacity constraints of the energy storage battery, operating state constraints of the energy storage battery, upper and lower charge and discharge power constraints of the energy storage battery, capacity constraints of the energy storage battery, maximum capacity constraints of the hydrogen storage tank, operating state constraints of the hydrogen storage tank, upper and lower limits constraints on the hydrogen charging and discharging quality of the hydrogen storage tank, and capacity constraints of the hydrogen storage tank.

[0085] As an optional implementation, the objective function is as follows:

[0086] minC=C inv +C om (19)

[0087] Where C is the total annual cost; C inv is the annual investment cost; C om is the annual operation and maintenance cost;

[0088] The annual investment cost is the sum of the annual investment costs of the ALK electrolyzer, PEM electrolyzer, energy storage battery and hydrogen storage tank. inv The calculation formula is as follows:

[0089]

[0090] in, is the annual investment cost of the ALK electrolyzer; is the annual investment cost of the PEM electrolyser; is the annual investment cost of the energy storage battery; is the annual investment cost of the hydrogen storage tank; is the unit capacity investment cost coefficient of ALK electrolyzer; is the unit capacity investment cost coefficient of PEM electrolyzer; is the unit capacity investment cost coefficient of the energy storage battery; E is the unit capacity investment cost coefficient of the hydrogen storage tank; ALK is the capacity of the ALK electrolyzer; E PEM is the capacity of the PEM electrolyzer; E bat is the capacity of the energy storage battery; E ht is the capacity of the hydrogen storage tank; r is the discount rate; L bat is the service life of the energy storage battery; L ht is the service life of the hydrogen storage tank; L ALK is the service life of ALK electrolyzer; L PEM The service life of the PEM electrolyzer.

[0091] The annual operation and maintenance cost is the sum of the annual operation and maintenance costs of the ALK electrolyzer, PEM electrolyzer, energy storage battery and hydrogen storage tank; the annual operation and maintenance cost C om The calculation formula is as follows:

[0092]

[0093] in, is the annual operation and maintenance cost of the ALK electrolyzer; is the annual operation and maintenance cost of the PEM electrolyzer; The annual operation and maintenance cost of the energy storage battery; is the annual operation and maintenance cost of the hydrogen storage tank;

[0094]

[0095] in, is the unit price of water; is the water consumption of the ALK electrolyzer in period t; is the water consumption of the PEM electrolyzer in period t; is the operation and maintenance coefficient of the unit capacity of the ALK electrolyzer; is the operation and maintenance coefficient of the PEM electrolyzer per unit capacity; α is the conversion rate of water to hydrogen; is the amount of hydrogen produced by the ALK electrolyzer in the tth period; is the amount of hydrogen produced by the PEM electrolyzer in the tth period; is the operation and maintenance coefficient of the energy storage battery per unit capacity; is the operation and maintenance coefficient of the unit capacity of the hydrogen storage tank.

[0096] As an optional implementation, the expression of the power balance constraint is:

[0097] P t re +P t grid+ +P t dis =P t ALK +P t PEM +P t grid- (32)

[0098] P t grid+ =P t grid+,ALK +P t grid+,PEM (33)

[0099] Among them, P t grid+ is the sum of the power output from the grid to the ALK electrolyzer and the PEM electrolyzer during the t period; P t grid- is the power of renewable energy connected to the grid during the tth period; P t grid+,ALK is the power output from the grid to the ALK electrolyzer in period t; P t grid +,PEM is the power output from the grid to the PEM electrolyzer during period t.

[0100] The expression of hydrogen load constraint is:

[0101]

[0102] in, is the hydrogen load of the hybrid hydrogen production system in period t; is the hydrogen load of the ALK electrolyzer at period t; is the hydrogen load of the PEM electrolyzer in period t; is the hydrogen filling mass of the hydrogen storage tank; is the hydrogen discharge mass of the hydrogen storage tank.

[0103] When the new energy hybrid hydrogen production system is actually running, the power grid often limits the grid-connected power of new energy. The expression of the grid-connected power constraint is:

[0104]

[0105] in, represents the variable of power output from the grid to the ALK electrolyzer, PEM electrolyzer, and energy storage battery at time period t; represents the variable of power output from new energy and energy storage batteries to the grid at time period t, is a 0-1 variable, 1 means the grid outputs power to the ALK electrolyzer, PEM electrolyzer and energy storage battery; t is the limit ratio of grid-connected power in period t, It is a 0-1 variable, where 1 means that new energy and energy storage batteries output power to the grid.

[0106] As an optional implementation, the expression for the maximum capacity constraint of the electrolytic cell is:

[0107]

[0108] Among them, E ALK is the capacity of the ALK electrolyzer; E PEM is the capacity of the PEM electrolyzer; The maximum optional capacity of the ALK electrolyzer; The maximum selectable capacity of a PEM electrolyzer.

[0109] The expression of the start and stop time constraint of the electrolyzer is:

[0110]

[0111]

[0112] in, is the startup state of the ALK electrolyzer at the t-1 period; is the startup state of the ALK electrolyzer at the tth period; is the startup state of the PEM electrolyzer at the t-1 period; is the hydrogen production state of the PEM electrolyzer at the tth period; The time that the ALK electrolyzer has been continuously powered on before the t-1 period; T is the continuous shutdown time of the ALK electrolyzer before the t-1 period; ALK,on The time required for the ALK electrolyzer to start up; T ALK,off The time required to shut down the ALK electrolyzer; The time that the PEM electrolyzer has been continuously powered on before the t-1 period; T is the continuous shutdown time of the PEM electrolyzer before the t-1 period; PEM,on The time required to start the PEM electrolyzer; T PEM,off The time required to shut down the PEM electrolyzer.

[0113] The expression of the overload operation time constraint of the electrolyzer is:

[0114]

[0115] in, is the overload operation state of the ALK electrolyzer in the t-1 period; is the overload operation state of the ALK electrolyzer in the tth period; is the overload operation state of the PEM electrolyzer in the t-1 period; is the overload operation state of the PEM electrolyzer in the tth period; The time that the ALK electrolyzer has been continuously overloaded before the t-1 period; T is the time that the PEM electrolyzer has been continuously overloaded before the t-1 period; ALK,over T is the maximum overload operation time allowed for the ALK electrolyzer; PEM,over The maximum overload operation time allowed for the PEM electrolyzer.

[0116] The expression of the upper and lower power constraints of the electrolyzer is:

[0117]

[0118] in, is the startup state of the ALK electrolyzer at the tth period; is the startup state of the PEM electrolyzer at the tth period; The minimum rated power factor allowed for the ALK electrolyzer per unit capacity; The maximum rated power factor allowed for the ALK electrolyzer per unit capacity; is the minimum rated power factor allowed for the PEM electrolyzer; The maximum rated power factor allowed for the PEM electrolyzer.

[0119] The expression of the ramp power constraint of the electrolyzer is:

[0120]

[0121] in, is the maximum climbing power coefficient of the ALK electrolyzer; is the climbing power of ALK electrolyzer; is the maximum ramp power factor allowed for the PEM electrolyzer; is the climbing power of the PEM electrolyzer.

[0122] As an optional implementation, the expression of the maximum capacity constraint of the energy storage battery is:

[0123]

[0124] Among them, E bat is the capacity of the energy storage battery; The maximum optional capacity of the energy storage battery;

[0125] The expression of the operating state constraint of the energy storage battery is:

[0126]

[0127] in, is the charging state of the energy storage battery at the tth period; is the discharge state of the energy storage battery in the tth period.

[0128] The expression of upper and lower limits of charge and discharge power of energy storage battery is:

[0129]

[0130] Among them, P t ch is the charging power of the energy storage battery in the tth period; is the upper limit of the charging power of the energy storage battery in the tth period; P t dis is the discharge power of the energy storage battery in the tth period; is the upper limit of the discharge power of the energy storage battery in the tth period.

[0131] The expression of the capacity constraint of the energy storage battery is:

[0132]

[0133] in, is the lower limit of the capacity of the energy storage battery in the tth period; is the capacity of the energy storage battery at the tth period; is the upper limit of the capacity of the energy storage battery in the tth period.

[0134] As an optional implementation, the maximum capacity constraint of the hydrogen storage tank is expressed as:

[0135]

[0136] Among them, E ht is the capacity of the hydrogen storage tank; is the maximum optional capacity of the hydrogen storage tank;

[0137]

[0138] in, is the hydrogen filling state of the hydrogen storage tank at the tth period; is the hydrogen release state of the hydrogen storage tank in the tth period.

[0139] The expression of the upper and lower limit constraints of the hydrogen filling and discharging mass of the hydrogen storage tank is:

[0140]

[0141] in, is the hydrogen filling mass of the hydrogen storage tank; is the hydrogen discharge mass of the hydrogen storage tank; The upper limit of the hydrogen filling mass of the hydrogen storage tank; It is the upper limit of the hydrogen discharge mass of the hydrogen storage tank.

[0142] The capacity constraint of the hydrogen storage tank is expressed as:

[0143]

[0144] in, is the lower limit of the capacity of the hydrogen storage tank in the tth period; is the capacity of the hydrogen storage tank at time period t; is the upper limit of the capacity of the hydrogen storage tank in the tth period.

[0145] Step S5, obtaining the new energy historical output data P of the hybrid hydrogen production system t re 、Hydrogen load historical data and historical data of grid-connected power limit ratio λ t .

[0146] Step S6, based on the historical output data of new energy, the historical data of hydrogen load and the historical data of grid-connected power limit ratio, a genetic algorithm is used to solve the capacity planning mathematical model of the hybrid hydrogen production system taking into account the overload operation and life attenuation of the electrolyzer, and determine the optimal capacity planning scheme of the hybrid hydrogen production system.

[0147] Specifically, step S6 includes:

[0148] Step S61, initialize the population, set the basic parameters of the genetic algorithm, input the historical output data of new energy, historical data of hydrogen load and historical data of grid-connected power limit ratio within one year, that is, and λ t .

[0149] Step S62: The rated life of the ALK electrolyzer and the rated life of the PEM electrolyser The input is used in the capacity planning mathematical model of the hybrid hydrogen production system taking into account the overload operation and life attenuation of the electrolyzer. After the genetic algorithm is iterated, the capacity of the ALK electrolyzer, PEM electrolyzer, energy storage battery and hydrogen storage tank is solved. and Recorded as Y1, and then calculate the actual life of ALK electrolyzer and PEM electrolyzer under this capacity configuration and

[0150] Step S63: Input the actual life of the ALK electrolyzer and the actual life of the PEM electrolyzer Through genetic algorithm iteration, the capacities of ALK electrolyzer, PEM electrolyzer, energy storage battery and hydrogen storage tank are solved. and Recorded as Y2, and then calculate the actual life of ALK electrolyzer and PEM electrolyzer under this capacity configuration and

[0151] Step S64: Calculate and If the corresponding life differences are all within δ years, it is considered that Y2 can be used as the optimal planning capacity of the hybrid hydrogen production system taking into account the overload operation and life decay of the electrolyzer. Otherwise, repeat step S62 and finally obtain the optimal capacity E after calculation. ALK 、E PEM 、E bat and E ht .

[0152] Beneficial effects of this application:

[0153] 1) This application constructs a hydrogen production energy efficiency attenuation model and a life attenuation model for the electrolyzer, filling the research gap in the characterization of the efficiency and life characteristics of the electrolyzer during overload operation, which is conducive to guiding the rational application of the overload operation characteristics of the hybrid electrolysis hydrogen production system.

[0154] 2) The proposed planning method for the hybrid hydrogen production system taking into account the overload operation and life attenuation of the electrolyzer enables the electrolyzer to fully utilize its overload operation characteristics, thereby reducing the configuration capacity of the electrolyzer and reducing the planning cost of the hybrid hydrogen production system. At the same time, it takes into account the hydrogen production efficiency and life attenuation caused by the overload operation of the electrolyzer, thereby ensuring the productivity of the hybrid hydrogen production system and enabling the hybrid hydrogen production system to operate reliably and economically in the long term.

[0155] Based on the same inventive concept, the embodiment of the present application also provides a capacity planning system for a hybrid hydrogen production system taking into account electrolyzer overload operation and life decay for implementing the above-mentioned capacity planning method for a hybrid hydrogen production system taking into account electrolyzer overload operation and life decay. The implementation scheme for solving the problem provided by the system is similar to the implementation scheme recorded in the above-mentioned method, so the specific limitations in one or more embodiments of the capacity planning system for a hybrid hydrogen production system taking into account electrolyzer overload operation and life decay provided below can be referred to the limitations of the capacity planning method for a hybrid hydrogen production system taking into account electrolyzer overload operation and life decay in the above text, and will not be repeated here.

[0156] In an exemplary embodiment, Figure 4 As shown, a capacity planning system for a hybrid hydrogen production system taking into account overload operation and life attenuation of an electrolyzer is provided, comprising:

[0157] The hybrid hydrogen production system construction unit 1 is used to construct a hybrid hydrogen production system; the hybrid hydrogen production system includes a power grid, a new energy generator set, an electrolyzer, an energy storage battery and a hydrogen storage tank; the electrolyzer includes an ALK electrolyzer and a PEM electrolyzer.

[0158] A hydrogen production energy efficiency attenuation model and a life attenuation model establishing unit 2, used to establish a hydrogen production energy efficiency attenuation model of an electrolyzer and a life attenuation model of an electrolyzer;

[0159] An operation model building unit 3 is used to build an operation model of the electrolyzer, an operation model of the energy storage battery and an operation model of the hydrogen storage tank; the operation model of the electrolyzer is built based on the hydrogen production energy efficiency attenuation model of the electrolyzer;

[0160] The hybrid hydrogen production system capacity planning mathematical model establishing unit 4 is used to establish a hybrid hydrogen production system capacity planning mathematical model taking into account the overload operation and life attenuation of the electrolyzer based on the life attenuation model of the electrolyzer, the operation model of the electrolyzer, the operation model of the energy storage battery and the operation model of the hydrogen storage tank;

[0161] A data acquisition unit 5 is used to acquire the new energy historical output data, hydrogen load historical data and grid-connected power limit ratio historical data of the hybrid hydrogen production system;

[0162] The optimal capacity planning scheme determination unit 6 is used to solve the capacity planning mathematical model of the hybrid hydrogen production system taking into account the overload operation and life attenuation of the electrolyzer based on the historical output data of new energy, the historical data of hydrogen load and the historical data of the grid-connected power limit ratio by using a genetic algorithm to determine the optimal capacity planning scheme of the hybrid hydrogen production system.

[0163] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0164] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0165] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0166] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0167] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A capacity planning method for a hybrid hydrogen production system taking into account electrolyzer overload operation and life attenuation, characterized in that: The hybrid hydrogen production system capacity planning method taking into account the overload operation and life attenuation of the electrolyzer comprises: Constructing a hybrid hydrogen production system; the hybrid hydrogen production system includes a power grid, a new energy generator set, an electrolyzer, an energy storage battery and a hydrogen storage tank; the electrolyzer includes an ALK electrolyzer and a PEM electrolyzer; Establish the hydrogen production efficiency attenuation model and the life attenuation model of the electrolyzer; Establishing an operation model of an electrolyzer, an operation model of an energy storage battery, and an operation model of a hydrogen storage tank; the operation model of the electrolyzer is constructed based on a hydrogen production efficiency attenuation model of the electrolyzer; Based on the life attenuation model of the electrolyzer, the operation model of the electrolyzer, the operation model of the energy storage battery and the operation model of the hydrogen storage tank, a capacity planning mathematical model of the hybrid hydrogen production system taking into account the overload operation and life attenuation of the electrolyzer is established; Obtain the historical data of renewable energy output, hydrogen load and grid-connected power limit ratio of the hybrid hydrogen production system; Based on the historical output data of new energy, the historical data of hydrogen load and the historical data of grid-connected power limit ratio, a genetic algorithm is used to solve the mathematical model of capacity planning of the hybrid hydrogen production system taking into account the overload operation and life attenuation of the electrolyzer, and determine the optimal capacity planning scheme of the hybrid hydrogen production system.

2. The capacity planning method for a hybrid hydrogen production system taking into account electrolyzer overload operation and life attenuation according to claim 1 is characterized in that: The hydrogen production energy efficiency attenuation model of the electrolyzer includes the hydrogen production energy efficiency attenuation model of the ALK electrolyzer and the hydrogen production energy efficiency attenuation model of the PEM electrolyzer; the life attenuation model of the electrolyzer includes the life attenuation model of the ALK electrolyzer and the life attenuation model of the PEM electrolyzer; The expression of the hydrogen production efficiency attenuation model of the ALK electrolyzer is: in, is the hydrogen production efficiency of the ALK electrolyzer at time period t; Rated hydrogen production efficiency for ALK electrolyzers; The rated hydrogen production efficiency degradation for the ALK electrolyzer; is the energy efficiency attenuation of hydrogen production by the ALK electrolyzer during overload operation at time period t, Indicates the overload operation state of the ALK electrolyzer in the tth period; T represents the upper limit of the time value; Δt is the time interval; The expression of the hydrogen production energy efficiency attenuation model of the PEM electrolyzer is: in, is the hydrogen production efficiency of the PEM electrolyzer at time period t; Rated hydrogen production efficiency for PEM electrolyzers; The rated hydrogen production efficiency decay for PEM electrolyzers; The energy efficiency attenuation of hydrogen production by the PEM electrolyzer during overload operation in period t; Indicates the overload operation state of the PEM electrolyzer in the tth period; The expression of the life attenuation model of ALK electrolyzer is: in, is the remaining life of the ALK electrolyzer in period t; is the rated life of the ALK electrolyzer; is the rated life decay of the ALK electrolyzer; is the overload operation life attenuation of the ALK electrolyzer in period t; The expression of the life attenuation model of the PEM electrolyzer is: in, is the remaining life of the PEM electrolyzer in the tth period; is the rated life of the PEM electrolyzer; is the rated life decay of the PEM electrolyzer; is the overload operation life attenuation of the PEM electrolyzer in period t.

3. The capacity planning method for a hybrid hydrogen production system taking into account electrolyzer overload operation and life attenuation according to claim 2 is characterized in that: The operation model of the electrolyzer includes an operation model of an ALK electrolyzer and an operation model of a PEM electrolyzer; The expression of the operation model of the ALK electrolyzer is: P t ALK =P t re,ALK +P t grid+,ALK +P t ch,ALK ; Among them, P t ALK is the power of the ALK electrolyzer in the tth period; P t re,ALK P is the power output from the new energy generator to the ALK electrolyzer in the t period; t grid+,ALK is the power output from the grid to the ALK electrolyzer in period t; P t ch,ALK is the power output from the energy storage battery to the ALK electrolyzer at time period t; is the hydrogen production efficiency of the ALK electrolyzer at time period t; is the mass of hydrogen produced by the ALK electrolyzer in time period t; The expression of the operation model of the PEM electrolyzer is: P t PEM =P t re,PEM +P t grid+,PEM +P t ch,PEM ; Among them, P t PEM is the power of the PEM electrolyzer in the tth period; P t re,PEM P is the power output from the new energy generator to the PEM electrolyzer in the t period; t grid+,PEM is the power output from the power grid to the PEM electrolyzer in period t; P t ch,PEM is the power output from the energy storage battery to the PEM electrolyzer at time period t; is the hydrogen production efficiency of the PEM electrolyzer at time period t; is the mass of hydrogen produced by the PEM electrolyzer in time period t; The expression of the operation model of the energy storage battery is: in, is the capacity of the energy storage battery at the tth period; is the capacity of the energy storage battery in the t-1 period; η bat,ch is the charging efficiency of the energy storage battery; η bat,dis is the discharge efficiency of the energy storage battery; P t ch is the charging power of the energy storage battery in the tth period; P t dis is the discharge power of the energy storage battery in the tth period; Δt is the time interval; The expression of the operation model of the hydrogen storage tank is: in, is the capacity of the hydrogen storage tank at time period t; is the capacity of the hydrogen storage tank at the t-1 period; is the hydrogen filling mass of the hydrogen storage tank at the tth period; is the hydrogen discharge mass of the hydrogen storage tank in the tth period; η ht,ch is the hydrogen filling efficiency of the hydrogen storage tank; η ht,dis is the hydrogen release efficiency of the hydrogen storage tank.

4. The capacity planning method for a hybrid hydrogen production system taking into account electrolyzer overload operation and life attenuation according to claim 3 is characterized in that: The mathematical model for capacity planning of the hybrid hydrogen production system taking into account overload operation and life attenuation of the electrolyzer includes an objective function and constraints; the objective function takes the annual total cost of the hybrid hydrogen production system as the minimum, and the constraints include power balance constraints, hydrogen load constraints, grid-connected power constraints, maximum capacity constraints of the electrolyzer, start and stop time constraints of the electrolyzer, overload operation time constraints of the electrolyzer, upper and lower power limits constraints of the electrolyzer, climbing power constraints of the electrolyzer, maximum capacity constraints of the energy storage battery, operating state constraints of the energy storage battery, upper and lower charge and discharge power limits constraints of the energy storage battery, capacity constraints of the energy storage battery, maximum capacity constraints of the hydrogen storage tank, operating state constraints of the hydrogen storage tank, upper and lower hydrogen charge and discharge quality limits constraints of the hydrogen storage tank, and capacity constraints of the hydrogen storage tank.

5. The capacity planning method for a hybrid hydrogen production system taking into account electrolyzer overload operation and life attenuation according to claim 4 is characterized in that: The objective function is as follows: minC=C inv +C om ; Where C is the total annual cost; C inv is the annual investment cost; C om is the annual operation and maintenance cost; Annual investment cost C inv The calculation formula is as follows: in, is the annual investment cost of the ALK electrolyzer; is the annual investment cost of the PEM electrolyser; is the annual investment cost of the energy storage battery; is the annual investment cost of the hydrogen storage tank; is the unit capacity investment cost coefficient of ALK electrolyzer; is the unit capacity investment cost coefficient of PEM electrolyzer; is the unit capacity investment cost coefficient of the energy storage battery; E is the unit capacity investment cost coefficient of the hydrogen storage tank; ALK is the capacity of the ALK electrolyzer; E PEM is the capacity of the PEM electrolyzer; E bat is the capacity of the energy storage battery; E ht is the capacity of the hydrogen storage tank; r1 is the discount rate; L bat is the service life of the energy storage battery; L ht is the service life of the hydrogen storage tank; L ALK is the service life of ALK electrolyzer; L PEM is the service life of the PEM electrolyzer; Annual operation and maintenance cost C om The calculation formula is as follows: in, is the annual operation and maintenance cost of the ALK electrolyzer; is the annual operation and maintenance cost of the PEM electrolyzer; The annual operation and maintenance cost of the energy storage battery; is the annual operation and maintenance cost of the hydrogen storage tank; in, is the unit price of water; is the water consumption of the ALK electrolyzer in period t; is the water consumption of the PEM electrolyzer in period t; is the operation and maintenance coefficient of the unit capacity of the ALK electrolyzer; is the operation and maintenance coefficient of the PEM electrolyzer per unit capacity; α is the conversion rate of water to hydrogen; is the amount of hydrogen produced by the ALK electrolyzer in the tth period; is the amount of hydrogen produced by the PEM electrolyzer in the tth period; is the operation and maintenance coefficient of the energy storage battery per unit capacity; is the operation and maintenance coefficient of the unit capacity of the hydrogen storage tank.

6. The capacity planning method for a hybrid hydrogen production system taking into account electrolyzer overload operation and life attenuation according to claim 5 is characterized in that: The expression of power balance constraint is: P t re +P t grid+ +P t dis =P t ALK +P t PEM +P t grid- ; P t grid+ =P t grid+,ALK +P t grid+,PEM ; Among them, P t re is the new energy output in period t; P t grid+ is the sum of the power output from the grid to the ALK electrolyzer and the PEM electrolyzer during the t period; P t dis is the discharge power of the energy storage battery in the tth period; P t ALK is the power of the ALK electrolyzer in the tth period; P t PEM is the power of the PEM electrolyzer in the tth period; P t grid- is the power of renewable energy connected to the grid during the tth period; P t grid+,ALK is the power output from the grid to the ALK electrolyzer in period t; P t grid+,PEM is the power output from the grid to the PEM electrolyzer at time period t; The expression of hydrogen load constraint is: in, is the hydrogen load of the hybrid hydrogen production system in period t; is the hydrogen load of the ALK electrolyzer at period t; is the hydrogen load of the PEM electrolyzer in period t; is the hydrogen filling mass of the hydrogen storage tank; is the hydrogen discharge mass of the hydrogen storage tank; The expression of the grid-connected power constraint is: in, represents the variable of power output from the grid to the ALK electrolyzer, PEM electrolyzer, and energy storage battery at time period t; represents the variable of power output from new energy and energy storage batteries to the grid in period t; t is the limit ratio of grid-connected power in period t.

7. The capacity planning method for a hybrid hydrogen production system taking into account electrolyzer overload operation and life attenuation according to claim 6 is characterized in that: The expression of the maximum capacity constraint of the electrolytic cell is: Among them, E ALK is the capacity of the ALK electrolyzer; E PEM is the capacity of the PEM electrolyzer; The maximum optional capacity of the ALK electrolyzer; is the maximum selectable capacity of the PEM electrolyzer; The expression of the start and stop time constraint of the electrolyzer is: in, is the startup state of the ALK electrolyzer at the t-1 period; is the startup state of the ALK electrolyzer at the tth period; is the startup state of the PEM electrolyzer at the t-1 period; is the startup state of the PEM electrolyzer at the tth period; The time that the ALK electrolyzer has been continuously powered on before the t-1 period; T is the continuous shutdown time of the ALK electrolyzer before the t-1 period; ALK,on The time required for the ALK electrolyzer to start up; T ALK,off The time required to shut down the ALK electrolyzer; The time that the PEM electrolyzer has been continuously powered on before the t-1 period; T is the continuous shutdown time of the PEM electrolyzer before the t-1 period; PEM,on The time required to start the PEM electrolyzer; T PEM,off The time required to shut down the PEM electrolyzer; The expression of the overload operation time constraint of the electrolyzer is: in, is the overload operation state of the ALK electrolyzer in the t-1 period; is the overload operation state of the ALK electrolyzer in the tth period; is the overload operation state of the PEM electrolyzer in the t-1 period; is the overload operation state of the PEM electrolyzer in the tth period; The time that the ALK electrolyzer has been continuously overloaded before the t-1 period; T is the time that the PEM electrolyzer has been continuously overloaded before the t-1 period; ALK,over T is the maximum overload operation time allowed for the ALK electrolyzer; PEM,over The maximum overload operation time allowed for the PEM electrolyzer; The expression of the upper and lower power constraints of the electrolyzer is: in, is the startup state of the ALK electrolyzer at the tth period; is the startup state of the PEM electrolyzer at the tth period; The minimum rated power factor allowed for the ALK electrolyzer per unit capacity; The maximum rated power factor allowed for the ALK electrolyzer per unit capacity; is the minimum rated power factor allowed for the PEM electrolyzer; is the maximum rated power factor allowed for the PEM electrolyzer; The expression of the ramp power constraint of the electrolyzer is: in, is the maximum climbing power coefficient of the ALK electrolyzer; is the climbing power of ALK electrolyzer; is the maximum ramp power factor allowed for the PEM electrolyzer; is the climbing power of the PEM electrolyzer.

8. The capacity planning method for a hybrid hydrogen production system taking into account electrolyzer overload operation and life attenuation according to claim 7 is characterized in that: The expression of the maximum capacity constraint of the energy storage battery is: Among them, E bat is the capacity of the energy storage battery; The maximum optional capacity of the energy storage battery; The expression of the operating state constraint of the energy storage battery is: in, is the charging state of the energy storage battery at the tth period; is the discharge state of the energy storage battery in the tth period; The expression of upper and lower limits of charge and discharge power of energy storage battery is: Among them, P t ch is the charging power of the energy storage battery in the tth period; is the upper limit of the charging power of the energy storage battery in the tth period; P t dis is the discharge power of the energy storage battery in the tth period; is the upper limit of the discharge power of the energy storage battery in the tth period; The capacity constraint expression of the energy storage battery is: in, is the lower limit of the capacity of the energy storage battery in the tth period; is the capacity of the energy storage battery at the tth period; is the upper limit of the capacity of the energy storage battery in the tth period.

9. The capacity planning method for a hybrid hydrogen production system taking into account electrolyzer overload operation and life attenuation according to claim 4 is characterized in that: The expression of the maximum capacity constraint of the hydrogen storage tank is: Among them, E ht is the capacity of the hydrogen storage tank; is the maximum optional capacity of the hydrogen storage tank; in, is the hydrogen filling state of the hydrogen storage tank at the tth period; is the hydrogen release state of the hydrogen storage tank at the tth period; The expression of the upper and lower limit constraints of the hydrogen filling and discharging mass of the hydrogen storage tank is: in, is the hydrogen filling mass of the hydrogen storage tank at the tth period; is the mass of hydrogen released by the hydrogen storage tank in the tth period; The upper limit of the hydrogen mass of the hydrogen storage tank; The upper limit of the hydrogen discharge mass of the hydrogen storage tank; The expression of the capacity constraint of the hydrogen storage tank is: in, is the lower limit of the capacity of the hydrogen storage tank; is the capacity of the hydrogen storage tank at time period t; It is the upper limit of the capacity of the hydrogen storage tank.

10. A capacity planning system for a hybrid hydrogen production system taking into account electrolyzer overload operation and life attenuation, characterized in that: The capacity planning system for a hybrid hydrogen production system taking into account electrolyzer overload operation and life attenuation is based on the capacity planning method for a hybrid hydrogen production system taking into account electrolyzer overload operation and life attenuation according to any one of claims 1 to 9, and the capacity planning system for a hybrid hydrogen production system taking into account electrolyzer overload operation and life attenuation comprises: A hybrid hydrogen production system construction unit, used to construct a hybrid hydrogen production system; the hybrid hydrogen production system includes a power grid, a new energy generator set, an electrolyzer, an energy storage battery and a hydrogen storage tank; the electrolyzer includes an ALK electrolyzer and a PEM electrolyzer; A hydrogen production energy efficiency attenuation model and a life attenuation model establishment unit, used to establish a hydrogen production energy efficiency attenuation model and a life attenuation model of an electrolyzer; An operation model establishment unit, used to establish an operation model of the electrolyzer, an operation model of the energy storage battery and an operation model of the hydrogen storage tank; the operation model of the electrolyzer is constructed based on a hydrogen production energy efficiency attenuation model of the electrolyzer; A hybrid hydrogen production system capacity planning mathematical model building unit is used to build a hybrid hydrogen production system capacity planning mathematical model taking into account electrolyzer overload operation and life attenuation based on the electrolyzer life attenuation model, electrolyzer operation model, energy storage battery operation model and hydrogen storage tank operation model; A data acquisition unit, used to acquire the new energy historical output data, hydrogen load historical data and grid-connected power limit ratio historical data of the hybrid hydrogen production system; The optimal capacity planning scheme determination unit is used to solve the capacity planning mathematical model of the hybrid hydrogen production system taking into account the overload operation and life attenuation of the electrolyzer based on the historical output data of new energy, the historical data of hydrogen load and the historical data of the grid-connected power limit ratio by using a genetic algorithm to determine the optimal capacity planning scheme of the hybrid hydrogen production system.

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